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That all depends on NVIDIA drivers being available for macOS
There are nvidia drivers for High Sierra - why can't the beta work with those? there are many of us with internal nvidia cards in mac pro towers, not rtx cards but 1080tis etc. Octane and Redshift are supported, why not Arnold?
There's no Optix 6 for macOS, and the required driver versions are the very very latest (just posted yesterday).
Thanks for your reply. As I understand it Apple will not be releasing any future drivers fo Nvidia, so it doesn't look like this will ever be supported on mac.